Holley sniper EFI motor suddenly revving uncontrollably when I blip the throttle

It won't do it until the motor is up to temperature, but at that point when I blip the throttle off idle hard enough it will stay at high rpm and will not return to idle.
This is system that has run normally for over a year. I am being told to check for vacuum leak, but I have no smoke tester. Been racing this combo for almost a year now and it has never done this before.
Gen3 hemi 414 stroker with mopar drag pak intake and Holley Sniper 4500 Throttle body Fuel injection.
Can also verify that temp sensor is staying wet all the time. We ditched the sniper for sequential. I cannot understand how you open the throttle blades for initial start up and then go back to zero when you verify.